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Quantitative characterization of defects in stereolithographic additive manufactured ceramic using X-ray computed tomography

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Journal of Materials science & technology 2022年第23期118卷 153-166页

作者： Keqiang Zhang Qiaoyu Meng Xueqin Zhang Zhaoliang Qu Rujie He Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081Chin

Ceramics have been widely fabricated by additive manufacturing(AM).Compared to conventional technologies,the strength of additive manufactured ceramic is relatively low owing to the formation of defects during manufacturing *** defects have significant effects on the microstructure and mechanical properties of additive manufactured ***,systematic research on defects,including defect geometrical features,quantitative statistics,and formation mechanism,as well as the intrinsic relationship with mechanical properties,need to be studied in *** this work,Al2 O3 ceramics were prepared from photosensitive slurries with different solid loadings by using stereolithographic(SL)additive *** defects,including their sizes and distributions,in both green and sintered bodies were investigated by using scanning electron microscopy(SEM)and X-ray computed tomography(X-CT).Geometrical features and quantitative statistics of the defects were evaluated and discussed to reveal their formation ***,the intrinsic relationship between defects and mechanical properties of the additive manufactured ceramic was *** study can give some fundamental understanding of the defects in additive manufactured ceramics.

关键词： Ceramic Stereolithographic additive manufacturing Defects X-CT Strength

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Cl-terminated decoration to modulate the permittivity of MXene for enhanced electromagnetic-absorbing performance

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Journal of Materials science & technology 2024年第12期179卷 187-197页

作者： Yunfei He Dongdong Liu Qiang Su Bo Zhong Long Xia Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264009China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China

The explosive growth of communication technology has given rise to a large number of high-quality electromagnetic wave(EMW)absorbing materials,and single-component materials are often difficult to satisfy the *** this study,we propose an etching method of molten chlorine salts under vac-uum to prepare Cl-terminated MXene(MX-Cl)which can meet the requirements of"thin,light,wide and strong"and realize the application of single-component absorbing *** the X and Ku bands,MX-Cl achieves a strong reflection loss of-42.99 dB and an effective absorption bandwidth of 3.44 GHz with the 1.2 mm matching *** presence of Cl groups restricts the free electron movement of surface-Ti,which controls the conductivity of the MX-Cl and optimizes its *** polarization induced by Ti-Cl,interfacial polarization between MXene layers and multiple scattering effects inside the layers all significantly increase the dielectric loss of the MX-Cl *** study provides a new approach to investigating the effect of single atoms on the dielectric properties of *** work also offers a simple and low-cost process for the preparation of single-component MXene EMW-absorbing materials.

关键词： Cl-terminated MXene Conductivity mechanism Multi-polarization effect Electromagnetic wave absorption

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Structural Difference in the Core-forming Block Reshapes RAFT-mediated Polymerization-induced Self-assembly

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Chinese Journal of Polymer science 2025年第3期43卷 429-438页

作者： Yue-Xi Zhan Li Zhang Chun Feng Jian-Bo Tan Department of Polymeric Materials and Engineering School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter Guangzhou 510006China Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Polymerization-induced self-assembly(PISA)has become one of the most versatile approaches for scalable preparation of linear block copolymer nanoparticles with various ***,the controlled introduction of branching into the core-forming block and the effect on the morphologies of block copolymer nanoparticles under PISA conditions have rarely been ***,a series of multifunctional macromolecular chain transfer agents(macro-CTAs)were first synthesized by a two-step green light-activated photoiniferter polymerization using two types of chain transfer monomers(CTMs).These macro-CTAs were then used to mediate reversible addition-fragmentation chain transfer(RAFT)dispersion polymerization of styrene(St)to prepare block copolymers with different core-forming block structures and the *** effect of the core-forming block structure on the morphology of block copolymer nanoparticles was investigated in *** electron microscopy(TEM)analysis indicated that the brush-like core-forming block structure facilitated the formation of higher-order morphologies,while the branched core-forming block structure favored the formation of lower-order ***,it was found that using macroCTAs with a shorter length also promoted the formation of higher-order ***,structures of block copolymers and the assemblies were further controlled by changing the structure of macro-CTA or using a binary mixture of two different *** expect that this work not only sheds light on the synthesis of block copolymer nanoparticles but also provide important mechanistic insights into PISA of nonlinear block copolymers.

关键词： Polymerization-induced self-assembly RAFT polymerization Block copolymer nanoparticles Branched structure

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Synergistically enabling the interface stability of lithium metal batteries with soft ionic gel and garnet-type Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)ceramic filler

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Journal of Materiomics 2023年第3期9卷 568-576页

作者： Qiujun Wang Weiqi Zhu Ya Su Di Zhang Zhaojin Li Huan Wang Huilan Sun Bo Wang Dan Zhou Li-Zhen Fan Hebei Key Laboratory of Flexible Functional Materials School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050000China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China

Lithium metal batteries based on solid electrolytes are considered as promising candidates with high energy density and ***,the weak solid-solid contact between electrolyte and electrode can easily lead to interface instability and lithium ions discontinuous migration,which seriously reduces the electrochemical performance of the ***,we construct a soft gel interfacial layer to improve the stability of the solid-solid interface between electrolyte and electrode by means of polyester-based monomers and imidazole-based ionic *** on this,garnet-type Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)particles as inorganic ceramic filler were introduced in the layer to obtain composite electrolytes with high ionic conductivity(up to 1.1×10^(-3)S/cm at 25℃).As a result,the assembled lithium symmetric battery of Li|THCE-15%LLZTO|Li suggests excellent cycling stability with 700 h at 0.1 mA/cm^(2)at 50℃,and the lithium metal batteries of LFP|THCE-15%LLZTO|Li delivers high initial discharge capacity of 128.2 mA·h/g with capacity retain of 75.48%after 150 cycles at 2 *** work paves a new route to build safe and stable lithium metal batteries with synergistic introduction of composite electrolytes between electrolyte and electrode using soft gel interfacial layer and inorganic filler.

关键词： Lithium metal batteries Ionic liquid In-situ polymerization Soft interfacial layer composite electrolyte

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Low thermal conductivity of dense(TiZrHfVNbTa)C_(x) high-entropy carbides by tailoring carbon stoichiometry

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Journal of advanced Ceramics 2023年第1期12卷 49-58页

作者： Lei CHEN Wen ZHANG Wenyu LU Boxin WEI Sijia HUO Yujin WANG Yu ZHOU Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structural–Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150001China

Transition metal carbides are promising candidates for thermal protection materials due to their high melting points and excellent mechanical ***,the relatively high thermal conductivity is still a major obstacle to its application in an ultra-high-temperature insulation *** this work,the low thermal conductivity of dense(TiZrHfVNbTa)Cx(x=0.6-1)high-entropy carbides has been realized by adjusting the carbon *** thermal conductivity gradually decreases from 10.6 W·m^(−1)·K^(−1) at room temperature to 6.4 W·m^(−1)·K^(−1) with carbon vacancies *** to enhanced scattering of phonons and electrons by the carbon vacancies,nearly full-dense(97.9%)(TiZrHfVNbTa)C_(0.6) possesses low thermal conductivity of 6.4 W·m^(−1)·K^(−1),thermal diffusivity of 2.3 mm^(2)·s^(−1),as well as electrical resistivity of 165.5μΩ·*** thermal conductivity of(TiZrHfVNbTa)C_(0.6) is lower than that of other quaternary and quinary high-entropy carbide ceramics,even if taking the difference of porosity into account in some cases,which is mainly attributed to compositional complexity and carbon *** provides a promising route to reduce the thermal conductivity of high-entropy carbides by increasing the number of metallic elements and carbon vacancies.

关键词： high-entropy carbides thermal conductivity compositional complexity carbon vacancies

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Enhanced Intertwined Spin and Charge Orders in the t–J Model in a Small J Case

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Chinese Physics Letters 2023年第3期40卷 41-44页

作者：张渝梅佳伟陈伟强 Department of Physics and Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The one-band t–J model captures strong correlations in cuprate high-temperature *** accounts for the various intertwined spin and charge orders,and the superconductivity in the phase *** see the correlation effect on the intertwined orders,we implement the density matrix renormalization group method to simulate the t–J model in a small J case with t/J=10,which is in a deeper Mott region than that with t/J?3 in cuprate superconducting *** examine the results on a six-leg lattice with both the nearest and next-nearest-neighbor hoppings and antiferromagnetic coupling,and find the absence of superconductivity and enhanced intertwined spin and charge orders in the phase *** the stripe phases,we find a new SDW+CDW phase in which the spin modulation is a(π,π)antiferromagnetism,while the wavelength of the charge modulation is shorter than that of the stripe *** results suggest the enhanced intertwined orders and suppressed superconductivity in the deep Mott region.

关键词： compounds orders superconductivity

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A bi-functional catalyst strategy to selectively regulate sulfur redox kinetics in lithium-sulfur batteries

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Journal of Materials science & technology 2024年第6期173卷 54-62页

作者： Yanan Liu Xiaoxiao Huang Honglei Zhang Guangyu Qin Xiaoshuang Wang Meixiu Song Hongbo Liang Jingzhe Hong Yudong Huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Designing electrochemical catalysts has become a research hotspot due to their accelerating the polysulfide conversion of the sulfur cathode to inhibit the“shuttle effect”in lithium-sulfur ***,it is still a great challenge to design the heterogeneous selective electrochemical catalyst for inhibiting the“shuttle effect”.Herein,nickel cobalt phosphide and cobalt phosphide as the heterogeneous catalyst active sites embedded in the nitrogen-doped hollow carbon nanocages(NiCoP@CoP/NC)are reported,used for multi-step and multi-phase sulfur electrode reaction,and it is found that metal-sulfur d-p hybridization can effectively indicate the intrinsic catalytic activity of metal *** of labor and cooperation of the bi-active NiCoP@CoP as heterogeneous catalysts propel the stepwise polysulfide *** and CoP sites preferentially accelerate the long-chain polysulfide conversion reaction(S_(8)■LiPSs)and the short-chain polysulfide conversion reactions(LiPSs■Li_(2)S),***,the hollow and porous N-doped carbon structure can successfully suppress the volume effect and improve the conductivity of the sulfur *** unique design can obtain an effective inhibition of the shuttle effect and rapid electrode *** a result,Li-S batteries demonstrate a high initial capacity of 1063 mAh g^(-1) and a low-capacity decay of 0.04% per cycle within 1000 *** work provides a feasible idea for the design of host materials in Li-S batteries.

关键词： Shuttle effect d-p hybridization Heterogeneous catalysts Stepwise polysulfide conversion

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Integration of urchin-like MnCo_(2)O_(4)@C core–shell nanowire arrays within porous copper current collector for superior performance Li-ion battery anodes

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Rare Metals 2024年第2期43卷 599-611页

作者： Xue-Ru Zhang Qiong Wu Yong Zhang Xi-Fei Li Ting Xie Yu-Cheng Wu Instrumental Analysis Center Hefei University of TechnologyHefei230009China Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Hefei230009China School of Materials Science and Engineering Hefei University of TechnologyHefei230009China Institute of Advanced Electrochemical Energy Xi’an University of TechnologyXi’an710048China

Spinel MnCo_(2)O_(4) is a promising energy storage candidate as anode materials in lithium-ion batteries owing to synergistic effects of two intrinsic solid-state redox ***,low conductivity,poor rate capacity and rapid capacity fading have seriously impaired its practical *** overcome the inferiorities,urchin-like MnCo_(2)O_(4)@C core–shell nanowire arrays have been fabricated directly within a porous copper current collector via a facile hydrothermal method followed by a chemical vapor deposition carbonization *** a typical nanowire,the core is composed of interconnected MnCo_(2)O_(4)nanoparticles and the shell shows as a thin amorphous carbon *** integrated MnCo_(2)O_(4)@C/Cu structure could act as working anodes without using additives or polymer *** MnCo_(2)O_(4)@C/Cu possesses slightly longer Li-ion insertion/desertion pathway than that of MnCo_(2)O_(4)/Cu,the carbon shell could effectively prevent the pulverization of MnCo_(2)O_(4) and lower down charge transfer resistance and actively participate in Li-ion *** rearrangement of carbon atoms during lithiation/delithiation cycling could inhibit the formation of passive solid electrolyte interphase *** a result,the MnCo_(2)O_(4)@C/Cu electrode presents superior rate capacity(600 mAh·g^(−1) at 1 A·g^(−1)) and better stability(797 mAh·g^(−1) after 200 cycles at 100 mA·g^(−1)).The excellent reversible Li ion storage capacity,cycling stability and rate capacity endow MnCo_(2)O_(4)@C/Cu great potential as stable and high output integrated anode materials in Li-ion batteries.

关键词： MnCo_(2)O_(4)@C Urchin-like nanowire arrays Core-shell Integrated anode materials Lithium-ion batteries

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Crystalline@amorphous core-shell structure of WO3@WO_(3-x)S_(x) established via doping strategy for enhancing magnesium ions storage performance

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Journal of Magnesium and Alloys 2025年第3期13卷 1353-1363页

作者： Shiqi Ding Yuxin Tian Jiankang Chen Guofeng Wang Bing Sun He Lv Lei Wang Guicun Li Alan Meng Zhenjiang Li College of Materials Science and Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOEShandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongPR China Qingdao Engineering Research Center for New Metallic Functional Materials Characteristic Laboratory of Advanced Metal Functional Materials and Processing in Universities of ShandongQingdao Binhai UniversityQingdao 266555ShandongPR China

Designing cathode possessing crystalline@amorphous core-shell structure with both active core and shell is a meaningful work for resolving the low speciﬁc capacity,unstable cycling performance and sluggish reaction kinetics issues of rechargeable magnesium batteries(RMBs)by providing more active sites as well as releasing inner stress during ***,WO_(3)@WO_(3-x)S_(x) owning crystalline@amorphous core-shell structure containing both active core and active shell is constructed successfully by introducing S into metastable WO3 structure under temperatureﬁeld *** such structure,amorphous shell would provide continuous Mg^(2+)diffusion channels due to its isotropy property for most Mg^(2+)migrating rapidly to interface and then adsorb at ions reservoir formed by interfacial electricﬁeld for increasing speciﬁc *** also makes security for stable structure of WO_(3)@WO_(3-x)S_(x) by alleviating volume expansion of crystalline core WO_(3) during cycling to prolong cycling ***,“softer”ions S^(2-)would weaken interaction between hard acid Mg^(2+) and ionic lattice to enhance Mg^(2+)storage ***,WO_(3)@WO_(3-x)S_(x) delivers the superior cycling performance(1000 cycles with 83.3%),rate capability(88.5 mAh g^(-1) at 1000 mA g^(-1))and speciﬁc capacity(about 150 mAh g^(-1) at 50 mA g^(-1)),which is near 2 times higher than that of *** is believed that the crystalline@amorphous core-shell structure with both active core and shell designing via doping strategy is enlightening for the development of high-performance RMBs,and such design can be extended to other energy storage devices for better electrochemical performance.

关键词： Doping Sulfuration Crystalline@amorphous core-shell structure WO_(3) Rechargeable magnesium batteries

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Dried bonito flakes-inspired moisture-responsive actuator with a gradient structure for smart devices

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Journal of Materials science & technology 2023年第36期167卷 152-160页

作者： Zhong Chen Qingyu Peng Ying Hu Zonglin Liu Xu Zhao Pengyang Li Liangliang Xu Haowen Zheng Fuhua Xue Renjie Ding Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China Institute of Industry&Equipment Technology Hefei University of TechnologyHefei 230009China

Exploring high-performance soft actuators from biomass resources is significant for developing eco-friendly smart *** bonito(DB)flake is a common food as well as a biomass material,and it can produce irregular motion in changed moisture,just like *** by this intriguing phenomenon,a cost-effective,biocom patible,and biodegradable moisture-responsive DB film actuator with a gradient structure is *** DB film actuator exhibits rapid and reversible bending deformation triggered by a humidity gradient with a high bending speed(40°s-1)and a maximum bending angle(180°).More-over,the DB film actuator shows large bending deformation(-71°to+51°)with a high actuation force(214.7 Pa)in response to changes in relative ***,the actuation performance can be also tuned by adjusting the thickness of the *** applications of this actuator,including smart grippers,crawling robots,and biomimetic flowers for visible humidity sensing,are *** importantly,smart sweat-responsive wearables that automatically deform to promote sweat evaporation and convection during exercise are constructed based on the actuator,making it promising for adaptive personal thermal *** work offers an easily processable,cost-effective,and environmentally benign strategy to construct moisture-responsive actuators for future eco-friendly smart devices.

关键词： Moisture-responsive Dried bonito flakes Actuators Smart wearables Soft robots

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